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NS_S_REBUFFERING
Windows Media source entered rebuffering
NS_S_REBUFFERING is HRESULT 854984 (0x000D0BC8) from Windows Media. The documented description is “The requested operation has caused the source to rebuffer.” The severity bit indicates a nonfailure result, but the value carries a specific condition that must not be collapsed into plain S_OK.
In the legacy Windows Media pipeline or Player state, this result means that the requested operation has caused the source to rebuffer. A generic success branch is insufficient here because continuation and output validity remain code-specific.
Where the status is encountered
- Windows Media Player SDK automation; log the exact method and object state instead of interpreting the constant outside that contract.
- Media graph, playlist, image, rights, or buffering state; log the exact method and object state instead of interpreting the constant outside that contract.
What must be true before accepting it
Verify that playback is paused or adapted until enough data exists and the client does not treat a temporary buffer underrun as end of stream. This boundary is where it changes from useful state information into a potentially mishandled result.
A retry decision requires evidence about already-completed work and outstanding work.
Evidence to preserve
- Preserve buffer percentage and target.
- Preserve network throughput and latency.
- Preserve media bitrate.
- Preserve playback position.
- Preserve rebuffer count and duration.
Correct handling and recovery
Show buffering state, monitor progress and throughput, and resume when the source signals readiness. Escalate only after a bounded stall or repeated rebuffering threshold.
A blind retry of it can duplicate effects or conceal a terminal condition, so require a documented trigger.
Difference from nearby results
Branching precisely on it prevents cancellation, pending work, and partial output from sharing one path.
Practical scenario
A variable-bandwidth stream drains its buffer. The player pauses presentation, reports progress, and resumes at the same media time after the buffer recovers.
References
- Microsoft: Windows Media Format SDK error codes — official Microsoft material relevant to this HRESULT.
- Microsoft: Windows Media Player SDK
- Microsoft: Windows Media Player buffering event
- Microsoft: HRESULT values
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